What is the most effective way to reduce calving birth weights?

• A. Use a bull known to sire calves with low birth weights
• B. Increase nutrition to dam during gestation
• C. Breed to smaller cows
• D. Delay breeding season

Answer: (A)

Birth weight has a genetic component, so you can influence it by choosing sires whose calves tend to be lighter at birth. Selecting a bull known to sire low-birth-weight calves directly shifts the genetic potential of the next generation toward smaller newborns, which helps reduce calving difficulty across many offspring without needing to change every individual cow’s management.

Increasing nutrition during gestation often increases fetal growth, which can raise birth weight rather than lower it, so it isn’t the right lever for reducing birth weight. Breeding to smaller cows can reduce birth weight, but it comes with trade-offs in overall herd performance and may limit production in other areas. Delaying the breeding season doesn’t affect the calves’ birth weights at all; it only shifts when they’re born.